entrance lock

entrance lock

[′en·trəns ‚läk]
(civil engineering)
A lock between the tideway and an enclosed basin made necessary because the levels of the two bodies of water vary; by means of this lock, vessels can pass either way at all states of the tide. Also known as guard lock; tidal lock; tide lock.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
Police said the perpetrators entered the enclosed area by cutting the entrance lock.
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The entrance lock measures about 12 metres by 50 metres, and the dock covers about 5,000 square metres.
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At the Blackwall end of the West India Dock, next to the old entrance lock is Cold-harbour, a narrow cobbled lane that runs parallel to the river and loops round to the later entrance lock in the South West India Dock.
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Princess Elizabeth and Lieutenant Philip Mountbatten, aboard the Mersey Docks & Harbour Board's steam tender Galatea with two large loudspeakers perched on the bow, open Liverpool Docks' new Waterloo entrance lock on May 30, 1940
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But first we had to pass through the canal's narrow-looking entrance lock - a delicate procedure for a ship which is 270m long and more than 32m wide.
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